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Cytotoxicity of different concentrations of MnO2 nanosheets via 3-[4,5-dimethylthiazol-2-thiazolyl]-2,5-diphenyl tetrazolium bromide (MTT) assay. Vero cells were incubated with MnO2 nanosheets separately for 12 and 24 h. Statistical significance was decided with a * p < 0.05.
